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‘Energy independent’ Uruguay runs on 100% renewables for four straight months
(theprogressplaybook.com)
This is a most excellent place for technology news and articles.
53% of power currently being generated by wind, the rest hydro. So there you go. They seem to be doing it, so there's your answer.
Yes they have multiple forms of energy generation, that does not answer the question as to wether their biofuel is sustainable. Yes it's carbon neutral (ish) but can they produce the biomass as fast as they consume it?